Winding machine



W. L. PERRY WINDING MACHINE Oct. l, 1957 Filed April 17". 1956 2Sheets-Sheet 1 Oct. l, 1957 w. L. PERRY 2,808,216

WINDING MACHINE Filed April 17, 1956 2 Sheets-Sheet 2 WINDING MACHINEWinthrop L. Perry, Milford, N. H., assignor to Abbott Machine Co., Inc.,Wilton, N. H., a corporation of New Hampshire Application April 17,1956, Serial No. 578,756

4 Claims. (Cl. 242-31) This invention relates to winding machines,particularly for Winding bobbins with the so-called lling or weft wind,as for use in loom shuttles. In that type of wind the thread istraversed with a relatively short stroke and the zone of this shortstroke of traverse is progressively advanced along the winding bobbin.

In this type of machine, particularly when fully automatic, it isdesirable to impart the short stroke of traverse by means of a frictionslider, that is, a slider which has only a frictional engagement and nota positive engagement with a reciprocating traverse rod. Rotating camsor cam-like elements are almost universally used to eifect the shortstroke traversing motion in filling winding. The use of a reciprocatingtraverse rod enables the driving cam to be Well out of the way of theregion of winding and avoids any need for this cam to follow along withthe slow axial progression of the traverse. The frictional connectionbetween the slider and traverse rod enables the slider, and thread guideto be readily slid back to a position where the winding is to start onthenext bobbin. The frictional connection between the slider andtraverse rod also facilitates winding the starting bunch of thread on aloom bobbin, since the frictional connection permits the thread guide tobe confined to a narrow zone during the winding of the bunch, while thetraverse rod is making its regular traversing stroke which is longerthan the length of the narrow zone of bunch winding.A

Although a friction slider has these advantages, it has also imposed alimit upon the speed of winding, and the present invention aims toovercome this,

The friction slider principle involves a suicient grip of the sliderupon the reciprocating traverse rod so that the slider will followfairly closely the motion of the traverse rod. Thus after each stroke,the friction slider, under the driving influence of the rod, needs to beaccelerated to the relatively high speed of traverse. If the grip of theslider upon the rod is insufficient, there is lost motion between therod and slider during the times the slider should be moving the threadin accordance with the movement of the rod, and the movements of theslider and thread become erratic. ln practice, in the use of frictionsliders such as disclosed in U. S. Patents Nos. 2,362,455 and 2,377,367,it has been customary to arrange the slider to grip the rod with africtional grip of 2 to 21A pounds, to cause the slider properly topartake of the motion of the rod.

However, it can be demonstrated that this required grip risesdisproportionately if the speed of the rod is increased. It is believedthat the force required to accelerate the slider from a standstillincreases as the square oi' the speed to which it is accelerated. Thisincreased force could of course be obtained from the reciprocating rod,but for transmission of this increased force from the rod to the slider,correspondingly greater frictional grip of the slider upon the rod wouldbe needed, so that the required frictional grip likewise would increaseas the square of the speed. Thus doubling the speed would require fourtimes the frictional grip, tripling the speed nited States Patent ricewould require nine times the frictional grip, etc. For instance, if twopounds frictional grip are required for operation at a given speed,tripling the speed of the device Would require a frictional grip in theregion of eighteen pounds.

Such strong frictional grip of the slider on the rod would cause undueWear and strain during the progressive advance of the slider along therod during winding. After the bobbin was wound the excessive grip of theslider upon the rod would interfere With sliding the slider back alongthe rod.

It can now be seen that by its peculiar requirement that the slidershould follow closely the movement of the rod and yet be readilyslidable along the rod, the friction slider principle has imposed alimitation on the speed of traverse, and hence on the speed of winding.

The present invention provides a very easy-running machine, in whichstrain and wear are kept at a minimum even for very high speeds oftraverse.

By way of explanation of the present invention, the friction sliderprinciple can be adapted to very high speed winding by relatively simplechanges along the following lines. ri`he frequency of recprocation(strokes per minute)V of the traverse rod and accordingly of thefriction slider are increased to correspond to the desired highfrequency of traverse and high speed of winding, but by reduction in thelength of stroke of the traverse rod and friction slider their linearvelocities are kept moderate. The relatively short stroke of the slideris converted to a longer stroke of traverse by means of the thread guidearm which traverses the thread. The moderate linear speed of thetraverse rod and slider permits the slider to gripY the rod onlylightly, and yet partake properly of the motion of the rod duringwindingat high speed. No excessive force is required either for theprogressive advance of the slider along the rod during the windingoperation or for the return of the slider along the rod in preparationfor the next winding operation.

Various types of winders have of course been provided with pivotedthread guide arms, but so far as I am aware, these have not served thepurpose of reducing the grip which a friction slider needs to exert uponits traverse rod in order to follow properly the motion of the rod. Theinvention is applicable to automatic loom bobbin winders,` whether theirwinding units travel or are stationary.

In the accompanying drawings,

Fig. l is a plan view of the head portion of a traveling spindle windingunit including the improved traverse mechanism of the present invention;

Fig. 2 is an elevation of the device of Fig. l;

Figs. 3 and 4 are plan views on a larger scale than Fig. 1, showing thethread guide carriage,` these views showing the thread guide carriage inopposite extreme positions;

Fig. 5 is a vertical sectional view taken on the line 5 5 of Fig. 3;

Fig. 6 is a view taken on the line 6 6 of Fig. 5; and

Fig. 7 is an enlarged view of the friction element, carried by theslider, frictionally gripping the traverse rod.

The winding unit to which the invention is shown as applied includes aninner chuck 20 for the base of the winding bobbin and an outerretractible chuck 21 for the tip of the vWinding bobbin. Inner chuck 20is driven by a direct connection from an electric motor 25 which also,through a worm, worm gear, traverse cam and cam follower, reciprocatethe traverse rod 30. These driving connections are similar to those ofsaid U..S. patents. It may be pointed out however that the stroke of thetraverse rod of the present device, is for example, only one third thatof the stroke of the traverse rod in the winding unit of said patents,and that in use, the

motor 25 of` the present device may have a speed of for example threetimes that of themot'ors' of the`winding units of said patents. Thisincrease in motor speed, andt corresponding increase in speed ofWinding, may mostreadil'y'be obtained by an increase in thefrequency ofthe. supply current, for example from sixty cycles t'oV one hundred'eighty cycles.

The thread guideV carriage indicated generally at 40, is movable along,a bar 41 parallel with the axis ofthe winding bobbin. Anysuitable meansmay be provided for imparting a progressive advance to the thread guidecarriage from the` base to the tip of the bobbin, either underthe-control of a feeler which responds to the growth ofA the windingupon the bobbin, or at a predetermined rate. For simplicity, the threadguide carriage is here shown as provided with a connection forVadvancing it in this latter manner, that. is, at a predetermined rate. Abar 43 slidable in guides 44 carries ups-tauding cam follower rolls 45,46. and 47, and'is interconnected by a bracket 48A with the thread guidecarriage as shown in Eig.. 2. Cam follower rolls 45, 46 and 47 areadapted to engage successive stationary cams C along the. course of the.travel of the winding unit,` to advance` the thread guide carriage fromthe base` to the tip. of the bobbin. Other stationary cams may engagethe rollers to move the thread guide carriage back toward the base chuckpreparatory to reception of a new empty bobbin in the chucks. A frictionslider indicated generally at 50 in Figs. 3 to 5 includes the generalconstructional features of the friction slider of said patents.Inparticular the slider includes end' plates 51, 52 through which thetraverse rody 30 loosely passes, a top plate 53 and a bottom` plate 54,these four plates being riveted together into the-form of a rigidbox-like structure.

Within. this box-like structure a sheet of feltV 56 is held` wrappedaround the traverse rod 30, in frictional engagement therewith, by ametallic spring clip S7.

The friction slider thus grips the traverse rod frictionally, and asindicated above, the grip may be in the region of two pounds, which is asuiciently light grip to enable the slider to be slidl along thetraverse rod easily.

Asshown in Figs. 3 and 5 a portion- 51:a projecting 'from the top plate53 of the friction slider extends into a groove in: the thread guidecarriage, this portion 53a carrying anti-friction pads 58 which slide inthe groove, guiding the slider and preventing rotation around? thetraverse rod.

A plate 60, secured to the thread guide carriage, 40, has opstandingportions 61 and 62 which limit the motion of the friction sliderrelativeto the thread guide: carriage. As. show-n, this motion isrelatively short, onlyl approximately one-third of the stroke requiredfor the thread guiding end of the thread guide. The reciprocating motionof the traverse rod 3G is correspondingly short, being approximately thesame inV length as the length of the relative motion between thefriction slider and the thread guide carriage.

The thread guide is in the form of an arm 65 having any suitable threadengaging. member such as an eye 66 at its outer end which overlies thewinding bobbin. The thread guide arm is under the joint control: of thethread guide carriage and' friction slider and is so engaged by thesethat althoughthe thread is Vtraversed at a high speedf at? the point 66,this high speed is derived from movement of the friction slider Ywhichis materially slower, for example only one-third as fast as the speed'of traverse of the thread. This relation of speeds is obtained` byreason of the fact that. the distance between the places of operativeengagement of the armv by the slider and by the carriagek is materiallyless than the distance. between this latter place andthe region oftraversel of the: thread by the eye 66. A moderate speed: of' thefrictiony slider'relativeA to the' carriage thus producestfay muchhigher' speed: of traverse. ofV thev thread', for? example a speed oftraverse; appropriate toV operating Y v 4 the motor 25 with 180 cyclecurrent instead of 60 cycle current', with corresponding increase inspeed of'winding.

In the preferred embodiment shown, the thread guide is carried at itsinner end by a post 70 which pivots in the thread guide carriage 40.Then at about one-third the distance from this pivot point 70 to thepoint 66, the thread guide extends, slidingly through a sleeve 71 ofanti-friction material pivoted at 72` to the friction slider. Otherspecific forms of interconnection of the thread. guide arm, threadguide.- carriage and4` friction slider, having a similarmotion-multiplying eitect can: be; employed, the arrangement here shownbeing preferred because of its simplicity,` compactness, andl lightness.

It will now be apparent that the invention has removed the limitationpreviously. inherent; in traversing mechanism of the friction slidertype, namely the limit upon winding speed that has been imposed bynecessity for excessively high gripping force of the slider upon thetraverse rod'. By use of the present invention, the gripping force canbe light, permitting easy operation of the device in the shifting ofVthe slider from base to tip of the hohbin during, winding, inthe returnof the slider in preparation for start of winding,` and during connementor restraint of the slider to. a restricted zone during Ybunch winding.

In the preferred form of friction slider shown, a post 75 extends upfrom the top plate 53. This post may be engaged by any suitable member.to adjust the slider from its position of' Fig. 4 to, its position ofFig. 3 after the carriage 40 has been returned to a position near thebase chuck` 20. When embodied in a machine in which the Windingunitstravel, such member may be interposed in the path of the. post and exerta camming action thereon. The. post 75 may also. be utilized: torestrict the slider from taking its full length of strokeA duringwinding. off the starting bunch,. in a manner similar to the rollernumbered one hundred sixty-'rive shown in Fig. 26 of said'Patent No.2,377,367.

I claim:

l. Winding machine traverse mechanism comprising a threadguide carriageadapted for progressive advance along the winding bobbin,V areciprocating traverse rod,.

a slider frictionally gripping the traverse rod: and reciprocablethereby, a thread guide arm. adapted to traverse the winding` thread,said arm; being operatively connected to the` carriage and to the sliderand controlled jointly by the carriage and slider, the: distance betweenthe places of operative connection of the ann to the slider and to, thecarriage being materially less than. thev distance between this` latterplace and the region of traverse of the thread by the arm, so. that thelinear. movements of the frictionally driven slider are materiallyshorter and slower than the corresponding traversing movements of` thethread, whereby notwithstanding high speeds of traverse ot the threadthe slider need grip the traverse rod only lightly.

2. Windingmachine. traverse mechanism as claimed in claim 1 in which thethreadr guide arm is operatively connected to thel slider between theregion of traverse of the thread and the place of operative connectionof the arm to the carriage.

3'. Winding machine traverse mechanismA comprising a. thread guidecarriage adapted for progressive advance along the winding bobbin, areciprocating traverse rod, a slider frictionally grippingv the traverserod and reciprocable'thereby, a thread guide arm adapted to traverse theWinding: thread, said' armv being pivoted to the carriage andoperatively connected to the slider andvr controlled jointly by theVcarriage and` slider, the distance between the place of operativeconnection of the arm to the slider and the vpoint of pivoting ofthe armto the carriage being materially less than the distance between thispoint ofpivotin'g and the region of traverse of the thread by the. arm,so that the linear movements of the frictionally driven slider arematerially shorter andy slower than the corresponding traversingmovements of the thread', where- Y 6 by notwithstanding high speeds oftraverse of the thread References Cited in the le of this patent theslider need grip the traverse rod only lightly. UNITED STATES PATENTS 4.Winding machine traverse mechanism as claimed in claim 3 in which asleeve pivoted to the slider opera- 2675899 Dersen De- 30 1941 tivelyconnects the slider to the thread guide arm, the 5 t FOREIGN PATENTS armbemg Shdable 1n the Sleeve- 17,512 AGreat Britain July 28, 1909 141,846Switzerland Oct. 16, 1930

